EP0437315B1 - Aufnahme- und Wiedergabegerät mit Editierfunktion - Google Patents

Aufnahme- und Wiedergabegerät mit Editierfunktion Download PDF

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Publication number
EP0437315B1
EP0437315B1 EP91300042A EP91300042A EP0437315B1 EP 0437315 B1 EP0437315 B1 EP 0437315B1 EP 91300042 A EP91300042 A EP 91300042A EP 91300042 A EP91300042 A EP 91300042A EP 0437315 B1 EP0437315 B1 EP 0437315B1
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EP
European Patent Office
Prior art keywords
recording
track
width
guard
heads
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91300042A
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English (en)
French (fr)
Other versions
EP0437315A1 (de
Inventor
Sigekazu Togashi
Kunio Suesada
Kunio Sekimoto
Yoshinobu Oba
Tadashi Nakayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Broadcasting Corp
Panasonic Holdings Corp
Original Assignee
Nippon Hoso Kyokai NHK
Japan Broadcasting Corp
Matsushita Electric Industrial Co Ltd
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Publication date
Application filed by Nippon Hoso Kyokai NHK, Japan Broadcasting Corp, Matsushita Electric Industrial Co Ltd filed Critical Nippon Hoso Kyokai NHK
Priority to EP95200339A priority Critical patent/EP0657881B1/de
Publication of EP0437315A1 publication Critical patent/EP0437315A1/de
Application granted granted Critical
Publication of EP0437315B1 publication Critical patent/EP0437315B1/de
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
    • G11B27/029—Insert-editing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/036—Insert-editing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
    • G11B27/024—Electronic editing of analogue information signals, e.g. audio or video signals on tapes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/032—Electronic editing of digitised analogue information signals, e.g. audio or video signals on tapes

Definitions

  • the present invention relates to a recording apparatus for recording video signals and audio signals onto magnetic tape and having editing function of performing assemble editing and insert editing on magnetic tape having signals thus recorded thereon.
  • D-1 format and D-2 format are standardized by the SMPTE for digital VTR's free from degradation in picture quality and audio quality caused by dubbing.
  • high definition VTR's for recording high-resolution television signals have also been put into practical use.
  • these digital VTR's and high definition VTR's a very large number of amount of information must be recorded and high recording density is demanded from the viewpoint of tape consumption, resulting in narrower track pitches (such as 39.1 ⁇ m in D-2).
  • Figs. 15A and 15B In some formats of conventional digital VTR's, audio sectors are disposed at the beginning and the end of helical tracks. For brevity of description, however, the track angle is disregarded and only video sectors are illustrated in Figs.15A and 15B. For the same reason, the recording head width is made equal to the track pitch W p .
  • FIG. 15B show the tape pattern obtained when an inserted tape pattern (hereafter simply referred to as insert pattern) deviates respectively on the delayed side (i.e., the illustrated right side) and on the advanced side (i.e., the illustrated left side) by W e with respect to the original tape pattern (hereafter simply referred to as original pattern).
  • PBa and PBb respectively denote positions wherein respective tracks are traced by a wide-width reproduction head having azimuth a and a wide-width reproduction head having azimuth b in the tracking state at the time of recording the original pattern.
  • tape pattern diagrams are shown in similar forms unless otherwise specified.
  • residue of erasing of the original pattern having the same azimuth as that of the leading track of the insert pattern (hereafter referred to simply as residue of the same azimuth) is generated by an amount corresponding to W e immediately before the in-point as evident from the Figure and the residue is mixed into the reproduction head PBa as disturbance at the time of reproduction. (This phenomenon is hereafter referred to as disturbance of the same azimuth.) Further, as this time, a track width of the original pattern corresponding to the same W e is shaved at the out point.
  • Fig. 15B When the insert pattern is deviated on the advanced side (lead side) (Fig. 15B), a track width of the original pattern immediately before the in-point corresponding to the same W e is shaved and disturbance due to the residue of the same azimuth corresponding to W e is caused at the out-point.
  • disturbance due to residue of the same azimuth and reduction in the track width are thus caused.
  • disturbance due to the residue of the same azimuth corresponds, in case of digital VTR's to degradation in reproduced signal which is 1.5 to 3 times that caused by reduction in track width.
  • disturbance due to the residue of the same azimuth corresponds to degradation in reproduced signal which is several ten times that caused by reduction in track width. (Hereafter, this ratio is referred to as disturbance coefficient of the same azimuth.) A great problem is thus caused.
  • the track width of all tracks including tracks other than the editing point is largely reduced as compared with the track pitch in the resultant tape format.
  • the disturbance due to the residue of the same azimuth and reduction in the track width as described above pose a great problem in narrow track recording of VTR's needing high-density recording such as high-definition VTR's or digital VTR's.
  • EP-A-0225733 describes apparatus for recording video signals onto a magnetic tape in which a new video signal can be inserted between a cut-in point and a cut-out point on a previously recorded signal. During editing current is not supplied to the rotary erase head for tracks which are erased even partially beyond the cut-in and cut-out points and the current of the recording head which records the tracks is increased.
  • An object of the present invention is to realize a recording apparatus having a tape format capable of reducing or preventing the disturbance caused by residue of erasing of the same azimuth at the editing point without reducing the track width excepting the vicinity of the editing point.
  • a magnetic recording apparatus having an editing function, wherein during normal recording operation, recording is performed with different azimuth angles in adjacent tracks without forming a guard band therebetween, said magnetic recording apparatus comprising:
  • Embodiments of the present invention will hereafter be described. In the ensuring description of embodiments, it is assumed that a digital VTR comprising tape wound over 180 degrees and recording heads and reproducing heads with two kinds of azimuth, i.e., azimuth a and azimuth b is used unless otherwise stated.
  • a first embodiment of the present invention will hereafter be described by referring to Figs. 1, 2 and 3.
  • the present embodiment aims at lightening the disturbance caused by residue to erasing of the same azimuth without reducing the track width excepting the vicinity of the editing point.
  • Fig. 1 is a block diagram showing the configuration of a first embodiment of the present invention.
  • Fig. 2 is a tape pattern configuration diagram of the present embodiment.
  • Fig. 2A shows an insert pattern deviated to the right side of that drawing by W e
  • Fig. 2B shows the insert pattern deviated to the left side of the drawing by the same W e .
  • Fig. 3A shows relations of head mounting angles.
  • Fig. 3B shows relations among head mounting height values and a recording process at the editing point.
  • FIG. 1 A video signal which is an input signal undergoes shuffling, parity addition for error correction, addition of a synchronizing signal and modulation in signal processing means 1.
  • the video signal is then supplied to signal recording means 2 comprising a recording amplifier and a recording head and recorded onto tape of a recording medium 4 under the control of system control means 3 at the time of recording.
  • track arrangement determining means 5 determines so as to record successively synchronizing blocks of the video signal corresponding to one field onto two tracks of the tape, controls the signal processing means 1, and transmits that information to guard position determining means 6.
  • guard position determining means 6 determines the position of a guard to be added for lightening disturbance due to the residue of erasing of the same azimuth as the track of the in-point, and controls guard adding means 7 comprising a flying erase head amplifier and a flying erase head to add the guard.
  • Figs. 3A and 3B Behind wide-width recording heads (RECa and RECb) each having a head width W rec , flying erase heads (FEa and FEb) each having the same width as guard width W g are mounted, respectively. Behind them, reproducing heads PBa and PBb) each having a sufficiently wide width as compared with the value W e of track deviation are mounted, respectively. Further, in this head configuration, the flying erase head is activated only at the in-point of editing.
  • guard width W g W em (K-1)/(K+1)
  • W rec ((K+2)W p + (K-1)W em )/(K+2)
  • the present embodiment comprises the signal recording means 2 for recording signals so that at least one track region including tracks recorded by heads having two or more different azimuth angles and alternately disposed may be provided and the track width of a new track may become wider on the backside only in a place where the backside of the new track abuts on a track previously recorded, and guard position determining means 6 for determining the guard position so that a guard may be disposed only in a place where the front of a new track newly recorded abuts on a track already recorded. As shown in Fig. 2, the guard is so added that the track width of the inserted track may not be reduced.
  • equivalent effective track width ET a value obtained by converting the quality of the reproduced signal into a track width
  • W em the value of the worst tracking deviation
  • the value of reduction of disturbance of the same azimuth caused by the guard becomes the guard width W g .
  • the value of improvement is 1/3 from equation (1).
  • the reduction effect of disturbance of the same azimuth owing to the effect of the wide-width recording head is 3(W rec - W p ) from equation (6) and (3/4) ⁇ W em from equation (2).
  • Insert editing has heretofore been described. In case of assemble editing, full erasing is activated after the in-point is passed and disorder of image at the time of reproduction of the out-point need not be considered. This is completely the same as the in-point of insert.
  • Fig. 1 is the configuration diagram thereof.
  • Fig. 12 is a configuration diagram showing Fig. 1 in more detail.
  • Fig.13 is a time chart for explaining Fig. 12.
  • Fig. 14 shows a concrete circuit of a gate pulse generating circuit 61 illustrated in Fig. 12.
  • Signal waveforms A - M of the time chart shown in Fig. 13 correspond to signals A - M of Fig. 12.
  • the track arrangement determining means 5 comprises a ROM 52, a memory control circuit 51 for controlling the ROM 52, and a latch circuit 53.
  • the track arrangement determining means 5 On the basis of a recording control signal A, a cylinder rotation synchronizing signal B and a system clock signal C, the track arrangement determining means 5 generates recording blanking signal F for avoiding the use with the exception of effective wrap angle of tape, a guard blanking signal G, a recording track start signal D for determining the recording timing of the recording signal and the guard, and a guard start signal E.
  • a latch circuit 12 In the signal processing means 1, a latch circuit 12 generates a recording pregate signal H on the basis of the recording control signal A and the recording track start signal D. In response to the recording pregate signal H, a gate circuit 13 gates the recording blanking signal F to generate a recording gate signal J. In response to the recording gate signal J, a gate circuit 14 gates an output signal of a signal processing circuit 11 generated at the timing of the recording track start signal D to output a recording signal L.
  • the input signal L is amplified by a recording amplifier circuit 21, passed through a 180-degree head changeover switch 22, and recorded onto the recording medium 4 alternately by recording heads 23 and 24.
  • a guard pregate signal I is produced from the recording control signal A and the guard start signal E, and the guard blanking signal G is gated by the guard pregate signal I, resulting in a guard gate signal K having a waveform K.
  • a flying erase circuit 71 oscillates during the high-level interval of the guard gate signal K to generate a flying erase signal having a waveform M.
  • the flying erase signal passes through a 180-degree head changeover switch 72 and erases signals recorded on the recording medium 4 at either flying erase head 73 or 74.
  • the gate pulse generating circuit 61 comprises two D latches 65 and 66 and one AND gate.
  • the guard position determining algorithm of the guard position determining means 6 will hereafter be described complementarily.
  • the rising edge of the recording control signal A is detected by taking a track as the unit. It is detected that a track preceding the track now being recorded by one track has not been recorded by recording of this time.
  • it is thus implemented in the present embodiment to predict the final adjacency relation between a new track to be recorded and the track previously recorded, determine the position of a guard to be added for the purpose of preventing residue of erasing of the same azimuth, and add guards selectively.
  • the track arrangement determining algorithm of the track arrangement determining means 5 is adapted to make a determination on the basis of which sector of every two tracks is being scanned by the recording head and which is selected out of five signals comprising the video signal and the 4-channel audio signals A1-A4 as the recording signal.
  • the determining algorithm of the guard position determining means 6 is adapted to make a determination so as to dispose a guard between sectors when the same sector preceding a sector to be newly recorded by one track is not recorded in the editing or recording mode of the same time.
  • a guard is added only between the track of channel A1 of the audio signal newly recorded and a track previously recorded as shown in Fig. 4B. Further, in case two channels A1 and A2 of the audio signal are inserted, a guard is added only between the track of channel A1 of audio signal newly recorded and a track previously recorded as shown in Fig. 4C and hence a guard is added to only the in-point of insert editing.
  • a wide-width reproducing head is used.
  • the disturbance coefficient K is not less than three, however, use of a narrow-width reproducing head yields a better result.
  • the guard width W g is preferably defined as half of the largest track deviation W em and the recording head width W rec is preferably defined as the track pitch W p plus half of the above described W em whereas reproducing head width W pb is preferably defined as the above described W p plus the above described W em .
  • the present embodiment heretofore described brings about an effect of reducing the disturbance of the same azimuth by the guard using flying erase or the wide-width recording head without reducing the track width excepting the vicinity of the editing point.
  • the present embodiment aims at realizing the tape pattern of the first embodiment by using a flying erase head which does not need high precision of track width.
  • the present embodiment comprises recording means including recording heads (RECa and RECb) each having a width wider than the track pitch W p and two or more azimuth angles, guard adding means including flying erase heads (FEa and FEb) mounted ahead of the recording heads, each of the flying erase heads having a width wider than at least the guard width, guard position determining means for making a determination so that the flying erase heads of the above described guard adding means may perform erasing in advance only in a place where the front of a newly recorded track abuts on an already recorded track, and reproducing means including reproducing heads (PBa and PBb) mounted behind the wide-width recording heads (RECa and RECb), each of the reproducing heads having a width sufficiently larger than the value W c of track deviation.
  • recording means including recording heads (RECa and RECb) each having a width wider than the track pitch W p and two or more azimuth angles
  • guard adding means including flying erase heads (FEa and FEb) mounted ahead of the recording heads, each of the flying erase
  • the tape pattern becomes the same as that of the first embodiment as evident from Fig. 5B although they differ in width and arrangement of flying erase heads.
  • the guard using the flying erase or the wide-width recording heads without reducing the track width excepting the vicinity of the editing point.
  • the precision of the guard width depends upon the relation between the bottom edge of the flying erase head and the bottom edge of the recording heads, and the head width precision of the flying erase head becomes unnecessary.
  • the present embodiment using flying erase heads having low precision in head width brings about an effect that the disturbance of the same azimuth can be reduced at the in-point of editing by the guard formed by the flying erase operation and at the out-point by the wide-width recording heads.
  • a third embodiment of the present invention will hereafter be described.
  • the present embodiment aims at reducing the disturbance due to residue of erasing of the same azimuth without reducing the track width of tracks all at the time of editing excepting the in-point and out-point of the original tape pattern.
  • Figs. 6A and 6B show tape pattern diagrams of the present embodiment. Configuration and operation of the present embodiment will hereafter be described by referring to Figs. 7A and 7B which show the head configuration for its recording and the recording process at its editing point.
  • wide-width recording heads (RECa and RECb) are mounted one track or more after flying erase heads (FEa and FEb) each having a width equivalent to twice the guard width W g as shown in Fig. 7B.
  • flying erase heads (PBa and PBb) each having a width sufficiently larger than the track deviation W e are mounted.
  • the flying erase heads are activated only at the in-point and out-point of editing. It is now assumed that the intensity of disturbance caused on the reproduced signal by disturbance of the same azimuth is represented by a disturbance coefficient K as compared with the degree of degradation of the reproduced signal caused by the reduction in track width.
  • guard width W g W em (K-1)/(K+1)
  • a recording apparatus of the present embodiment is so configured as to comprise guard adding means and signal recording means respectively including flying erase heads and recording heads having head configuration as heretofore described, and guard position determining means for determining guard positions in recording so that a guard may be disposed only between a track to be newly recorded and a previously recorded track.
  • degradation due to editing performed once may be caused on tracks (T ai and T ao ) immediately succeeding respectively the in-point and the out-point when the insert pattern loses and on tracks (T bi and T bo ) immediately preceding respectively the in-point and the out-point when the insert pattern gains as evident from Fig. 6.
  • the degradation is disturbance due to residue of erasing of the same azimuth.
  • the degradation is a reduction in track width.
  • equivalent effective track width ET a value obtained by converting the quality of the reproduced signal into a track width
  • W em the value of the worst tracking deviation
  • the tape pattern of the present embodiment brings about an effect that the disturbance due to residue of erasing of the same azimuth is reduced by the guard without reducing the track width of tracks at all excepting those located at the in-point and out-point of the original tape pattern at the time of editing.
  • the present embodiment aims at making an improvement over the disturbance due to the residue of erasing of overwriting as well while reducing the disturbance due to the residue of the same azimuth without reducing the track width excepting the in-point and out-point of the original tape pattern at the time of editing.
  • the head configuration of the third embodiment is adapted as shown in Figs. 8A and 8B to comprise signal recording means including recording heads (RECa and RECb) each having a head width equivalent to the track pitch W p , guard adding means including flying erase heads (FEa and FEb) mounted one track or more ahead of the recording heads, each of the flying erase heads having a width larger than the track pitch by twice the guard width W g , reproducing means provided with head configuration including reproducing heads (PBa and PBb) each having a width sufficiently larger than the track deviation W e mounted behind the flying erase heads, and guard position determining means for making a determination so that the flying erase heads may erase in advance the track located in a portion to be recorded at the time of recording.
  • signal recording means including recording heads (RECa and RECb) each having a head width equivalent to the track pitch W p
  • guard adding means including flying erase heads (FEa and FEb) mounted one track or more ahead of the recording heads, each of the flying erase heads having a width larger than the track
  • flying erase heads are mounted one track or more ahead of recording heads as shown in Fig. 8B. Wide-width flying erase heads do not erase the insert track. After editing, the tape pattern as shown in Fig. 6 is obtained. For disturbance of the same azimuth, therefore, the same effect as the third embodiment described before is obtained. As for the disturbance due to the residue of overwrite erasing, it is not caused because the insert portion is erased beforehand over the entire track width.
  • the tape pattern of the present embodiment maintains the effect of the above described embodiment that the disturbance due to the residue of erasing of the same azimuth is reduced without reducing the track width excepting the in-point and out-point of the original tape pattern at the time of editing. Since the insert portion is erased beforehand over the entire track width, an additional effect that residue of erasing due to overwriting is not caused is also obtained.
  • a fifth embodiment of the present invention will hereafter be described.
  • the present embodiment aims at reducing or preventing the disturbance due to the residue of erasing of the same azimuth without reducing the track width excepting the vicinity of the editing point.
  • the present embodiment is an example in a VTR comprising tape wound over 180 degrees and recording heads and reproducing heads respectively having two kinds of azimuth, i.e., azimuth a and azimuth b respectively as pair heads.
  • Figs. 9A and 9B show tape pattern configuration diagrams of the present embodiment. Configuration and operation of the present embodiment will hereafter be described by referring to Figs. 10A and 10B which show the head configuration for its recording and the recording process at its editing point.
  • the magnetic recording apparatus of the fourth embodiment described before is adapted to comprise guard adding means including flying erase heads each having a head width corresponding to a plurality of tracks and signal recording means for handling the plurality of tracks as one recording unit with respect to the track width direction at the time of recording and performing the recording operation.
  • guard adding means including flying erase heads each having a head width corresponding to a plurality of tracks and signal recording means for handling the plurality of tracks as one recording unit with respect to the track width direction at the time of recording and performing the recording operation.
  • the head configuration of the present embodiment comprises recording heads (REC a1 - REC b2 ) each having a head width equivalent to the track pitch W p , simultaneous reproducing meads (COF a1 - COF b2 ) each having a width sufficiently larger than the track deviation W e mounted behind the recording heads, flying erase heads (FE1 and FE2) preceding the above described recording heads by two or more tracks and each having a width which is larger than twice the track pitch W p by twice the guard width W g , and preceding reproducing heads (AD a1 - AD b2 ) preceding to the flying erase heads by two or more tracks and each having a width sufficiently larger than the track deviation W e .
  • the tape pattern of the present embodiment has such a configuration as shown in Figs. 9A and 9B that each guard is provided between a new track and a previously recorded track at the time of editing in a track region including tracks of two azimuths alternately.
  • PBa and PBb respectively denote a reproducing head of azimuth a and a reproducing head of azimuth b . They may be either of the preceding producing heads and the simultaneous producing heads. Further, they may be either of 1 and 2 located at the interval of 180°. (Hereafter, pattern diagrams are simply represented in this way.)
  • degradation at the time of editing may be caused on tracks (T ai and T ao ) immediately succeeding respectively the in-point and the out-point when the insert pattern loses and on tracks (T bi and T bo ) immediately preceding respectively the in-point and the out-point when the insert pattern gains as evident from Fig. 9.
  • the degradation is disturbance due to residue of erasing of the same azimuth.
  • the degradation is a reduction in track width.
  • equivalent effective track width ET a value obtained by converting the quality of the reproduced signal into a track width
  • W em the value of the worst tracking deviation.
  • equivalent effective track widths ET(T ai ), ET(T ao ), ET(T bi ) and ET(T bo ) respectively of tracks (T ai , T ao , T bi and T bo ) degraded by editing performed once are can be represented similarly to equations (11) - (14) of the above described third embodiment.
  • the degree of reduction in disturbance of the same azimuth at the time when insert editing is performed only once is the same as that of the third embodiment described before.
  • the degree of reduction in disturbance due to residue of erasing of overwriting is the same as that of the fourth embodiment.
  • editing is performed by taking two tracks as the unit. With regard to one track, only one side is degraded. Even when such editing as to define the adjacent area of the editing point as an editing point again is performed, therefore, increase of signal degradation at the editing point caused by repetition editing does not occur.
  • the configuration of the present embodiment reduces the influence caused at the time of editing. Even in such a VTR that a plurality of tracks are handled as one unit at the time of editing with regard to the track width direction, therefore, the configuration of the present embodiment brings about an effect that the disturbance due to residue of erasing of the same azimuth can be reduced by the guard without reducing the track width excepting the in-point and the out-point of the original tape pattern at the time of editing.
  • the present embodiment has been implemented in combination with the fourth embodiment. In the same way, however, the present embodiment may also be implemented in combination with the second embodiment. In combination with the second embodiment, such handling as to make two tracks as one editing unit in the track width direction becomes possible by removing the flying erase head FEb of Fig. 5 and widening the width of the flying erase head FEa of Fig. 5 by a value corresponding to one track.
  • a recording apparatus comprising not less than one consecutive tracks to be recorded together being defined as one set of track, a recording trajectory obtained as a result of recording information having an amount to be recorded by one recording process as at least one set of tracks being defined as one information trajectory, a set of tracks contained in sets of tracks included in the above described one information trajectory newly recorded, the above described set of tracks being adjacent to another set of tracks included in another information trajectory recorded earlier than the above described one information trajectory, and the above described guard position determining means making a selection so as to dispose a guard (guards) on one location or two locations included in two locations respectively before and after the above described set of tracks and so as not to dispose guards elsewhere.
  • a guard guard
  • a sixth embodiment will hereafter be described.
  • the present embodiment aims at relaxing head width precision when handling a plurality of tracks as one editing unit in the track width direction at the time of editing.
  • the signal recording means of the fifth embodiment is so configured that at least one of the recording heads may have a width equivalent to the track pitch and each of the remaining recording heads may have a width not less than the track pitch.
  • Figs.11A and 11B show head configuration of the present embodiment. As shown in these Figs., head width of each of only the recording heads REC b1 and REC b2 of the fifth embodiment remains equivalent to the track pitch, head width of each of the remaining recording heads REC a1 and REC a2 is expanded, and the width of each of the flying erase heads remains equivalent to two tracks plus twice the guard.
  • tracks recorded by the recording heads REC a1 and REC a2 are certainly shaved by tracks recorded by the recording heads REC b1 and REC b2 . This results in an effect that the width precision of the recording heads REC a1 and REC a2 becomes unnecessary.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Management Or Editing Of Information On Record Carriers (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Digital Magnetic Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Claims (7)

  1. Magnetaufzeichnungsgerät mit Schnittbetriebfunktion, bei dem bei normalem Aufzeichnungsbetrieb das Aufzeichnen mit unterschiedlichen Azimutwinkeln in nebeneinanderliegenden Spuren ohne Ausbildung eines dazwischenliegenden Schutzbands erfolgt, wobei das Magnetaufzeichnungsgerät aufweist:
    eine Mehrzahl von Aufnahmeköpfen; und
    eine Mehrzahl von Löschköpfen, welche aneinanderstoßend den Spuren folgen
    gekennzeichnet durch
    eine Schutzbandbestimmungseinrichtung (6), die zu einem Zeitpunkt des Einfügeaufzeichnens in Funktion ist und ein hinzuzufügenden Schutzband bestimmt, so daß
    (a) das Schutzband nicht zu einer Position hinzugefügt wird, bei der zwei von der Mehrzahl der neuen Spuren aneinanderstoßen, und
    (b) das Schutzband (Wg) zu einer voreilenden Seite von der Mehrzahl von neuen Spuren hinzugefügt wird; und
    eine Schutzbandhinzufügeeinrichtung (7), welche die Löschköpfe beinhaltet, die quer zur Spurrichtung jeweils bezüglich eines Aufnahmekopfes verschoben werden, um dem Aufzeichnungsmedium das Schutzband an der durch die Schutzbandbestimmungseinrichtung bestimmten Position hinzuzufügen.
  2. Magnetaufzeichnungsgerät nach Anspruch 1, bei dem ein Schutzband beiden Seiten, der voreilenden und der nacheilenden Seite, von der Mehrzahl der neuen Spuren (Figur 7B) hinzugefügt wird.
  3. Magnetaufzeichnungsgerät nach Anspruch 1, bei dem:
    jeder der Mehrzahl der Aufnahmeköpfe (RECa, RECb in Figur 3B) ein Kopfvon großer Breite ist, welche mehr als eine Spurteilung (Wp) beträgt, und jeder der Mehrzahl von Löschköpfen (FEa, FEb) eine Breite aufweist, die der Breite des Schutzbands entspricht,
    die Schutzbandpositionsbestimmungseinrichtung (6) eine Entscheidungsbedingung für das Hinzufügen des Schutzbands festsetzt, die darin bestht, daß das Schutzband nur zur voreilenden Seite der Mehrzahl von neuen Spuren hinzugefügt wird,
    eine letzte Spur der Mehrzahl von neuen Spuren so aufgezeichnet wird, daß sie eine Spurbreite aufweist, die größer ist als die Spurbreite der übrigen von der Mehrzahl von neuen Spuren, so daß die Spurbreite der letzten Spur sich nach hinten in zuvor aufgezeichnete Spuren erstreckt, die an die letzten Spuren angrenzen.
  4. Magnetaufzeichnungsgerät nach Anspruch 1, bei dem:
    der Löschkopf (FEa, FEb in Figur 5B) der Schutzbandhinzufügeeinrichtung (7) so angeordnet ist, daß er einen von der Mehrzahl von Aufnahmeköpfen vorauseilt, und
    der fliegende Löschkopf eine Breite aufweist, die größer als die Schutzbandbreite ist.
  5. Magnetaufzeichnungsgerät nach Anspruch 2, bei dem:
    die Signalaufzeichnungseinrichtung (2) die Mehrzahl von Aufnahmeköpfen (RECa, RECb, in Figur 8B) beinhaltet, welche eine Breite besitzen, die näherungsweise so groß wie die Spurteilung ist, und zwei oder mehr Azimutwinkel aufweisen,
    die Schutzbandhinzufügeeinrichtung (7) die Mehrzahl von Löschköpfen (FEa, FEb) beinhaltet, die jeweils so angebracht sind, daß sie einem entsprechenden von der Mehrzahl von Aufnahmeköpfen um mindestens eine Spur voreilen, wobei jeder der Löschköpfe eine Breite aufweist, die größer als die Spurteilung ist, und
    die Schutzbandpositionsbestimmungseinrichtung (6) die Mehrzahl von Löschköpfen der Schutzbandhinzufügeeinrichtung (7) steuert, um ein Teilstück von einer zu beschreibenden Spur, bevor es durch den Aufnahmekopf beschrieben wird, zu löschen.
  6. Magnetaufzeichnungsgerät nach Anspruch 5, bei dem:
    jeder von der Mehrzahl von Löschköpfen (FE1, FE2 in Figur 10B) von der Schutzbandhinzufügeeinrichtung eine Breite besitzt, die der Breite einer Mehrzahl von Spuren entspricht,
    die Signalaufzeichnungseinrichtung (2) einen Satz von Aufzeichnungsköpfen (RECa1, RECa2, RECb1, RECb2) beinhaltet, und
    zu einem Zeitpunkt des Einfügeaufreichnens eine Mehrzahl von Spuren, die der Breite der Löschköpfe entsprechen, durch den Satz von Aufnahmeköpfen als eine einzige Aufnahmeeinheit bezüglich einer Spurbreitenrichtung beschrieben werden.
  7. Magnetaufzeichnungsgerät nach Anspruch 6, bei dem:
    einer von dem Satz von Aufnahmeköpfen (RECb1, RECb2 in Figur 11B), welcher eine letzte Spur von der Mehrzahl der Spuren, welche als eine einzige Aufnahmeeinheit beschrieben werden, eine Breite besitzt, die der Spurteilung entspricht, und
    die anderen Aufnahmeköpfe von dem Satz von Aufnahmeköpfen eine Breite besitzen, die größer als die Spurteilung ist.
EP91300042A 1990-01-09 1991-01-03 Aufnahme- und Wiedergabegerät mit Editierfunktion Expired - Lifetime EP0437315B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95200339A EP0657881B1 (de) 1990-01-09 1991-01-03 Wiedergabegerät für magnetische Aufzeichnungen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1770/90 1990-01-09
JP2001770A JP2820477B2 (ja) 1990-01-09 1990-01-09 記録装置および再生装置

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP95200339A Division EP0657881B1 (de) 1990-01-09 1991-01-03 Wiedergabegerät für magnetische Aufzeichnungen
EP95200339.0 Division-Into 1991-01-03

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EP0437315A1 EP0437315A1 (de) 1991-07-17
EP0437315B1 true EP0437315B1 (de) 1996-05-22

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EP95200339A Expired - Lifetime EP0657881B1 (de) 1990-01-09 1991-01-03 Wiedergabegerät für magnetische Aufzeichnungen
EP91300042A Expired - Lifetime EP0437315B1 (de) 1990-01-09 1991-01-03 Aufnahme- und Wiedergabegerät mit Editierfunktion

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US (2) US5327295A (de)
EP (2) EP0657881B1 (de)
JP (1) JP2820477B2 (de)
CN (2) CN1031429C (de)
DE (2) DE69119613T2 (de)

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Publication number Priority date Publication date Assignee Title
CN1060905C (zh) * 1993-02-26 2001-01-17 三星电子株式会社 用于盒式磁带录像机音频信号的记录格式、方法及装置
JP3449776B2 (ja) * 1993-05-10 2003-09-22 松下電器産業株式会社 デジタルデータ記録方法および装置
JPH07105597A (ja) * 1993-10-05 1995-04-21 Matsushita Electric Ind Co Ltd 磁気記録装置の記録再生方法及びトラッキング方法
JPH09213022A (ja) * 1996-02-07 1997-08-15 Sony Corp 音声・映像データ記録・再生装置およびその方法
US5986839A (en) * 1996-09-17 1999-11-16 International Business Machines Corporation Electronic magnetoresistive sensor biasing using a transducer equivalent circuit and current sources
KR100469114B1 (ko) * 2000-02-03 2005-02-02 마쓰시타 덴키 산교 가부시끼 가이샤 디지털 방식의 자기 기록 장치 및 자기 기록/재생 장치
CA2440132C (en) * 2001-03-06 2011-10-11 True Manufacturing Co., Inc. Cleaning system for refrigerator condenser
US8027109B1 (en) * 2010-05-19 2011-09-27 International Business Machines Corporation Reuse of partially expired physical tape volume

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0225733A1 (de) * 1985-11-12 1987-06-16 Sony Corporation Magnetisches Aufzeichnungsgerät

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JPS57147383A (en) * 1981-03-06 1982-09-11 Hitachi Ltd Video insertion recorder
US4520405A (en) * 1981-06-22 1985-05-28 Victor Company Of Japan, Ltd. Insert recording system for a video signal
JPS5870474A (ja) * 1981-10-20 1983-04-26 Sony Corp 編集装置
JPS58224484A (ja) * 1982-06-22 1983-12-26 Matsushita Electric Ind Co Ltd 映像信号磁気記録再生装置
JPS60126988A (ja) * 1983-12-13 1985-07-06 Victor Co Of Japan Ltd 編集用記録再生装置におけるカラ−フレ−ムサ−ボ回路
JPH0721902B2 (ja) * 1986-03-20 1995-03-08 ソニー株式会社 ビデオテ−プレコ−ダ
JPH0715724B2 (ja) * 1986-04-11 1995-02-22 ソニー株式会社 回転磁気ヘツド装置
JPH01211208A (ja) * 1988-02-18 1989-08-24 Victor Co Of Japan Ltd 磁気記録再生装置

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0225733A1 (de) * 1985-11-12 1987-06-16 Sony Corporation Magnetisches Aufzeichnungsgerät

Also Published As

Publication number Publication date
US5418653A (en) 1995-05-23
US5327295A (en) 1994-07-05
CN1031429C (zh) 1996-03-27
DE69119613T2 (de) 1996-11-21
DE69129910D1 (de) 1998-09-03
JP2820477B2 (ja) 1998-11-05
EP0657881A2 (de) 1995-06-14
DE69129910T2 (de) 1999-06-17
CN1083249A (zh) 1994-03-02
CN1054163A (zh) 1991-08-28
JPH03207074A (ja) 1991-09-10
EP0657881B1 (de) 1998-07-29
EP0657881A3 (de) 1995-09-06
CN1033409C (zh) 1996-11-27
DE69119613D1 (de) 1996-06-27
EP0437315A1 (de) 1991-07-17

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